将哈希映射的整数值提取到整数数组[duplicate]

Question

预期的输出是值的排序数组：{3,2,1}。

import java.util.*;

public class test {
  public static void main(String [] args) {
    Integer[] number = {1, 2, 3, 3, 1, 1};
    HashMap<Integer, Integer> dist = new HashMap<>();
    Integer count;
    for (Integer i : number) {
      count = 1;
      if (dist.containsKey(i))
        count += dist.get(i);
      dist.put(i, count);
    }
    // Program fails below, *Object[] cannot be converted to Integer[]*. 
    Integer[] distArr = dist.values().toArray(); // Works if I replace Integer with Object
    distArr.sort(); // This fails on Object[]
    // ...
  }
}

Answer 1

Integer[] distArr = dist.values().toArray(Integer[]::new)

Integer[] distArr = dist.values().toArray(new Integer[dist.values().size()])

Integer[] distArr = dist.values().toArray(new Integer[0])